78391488 has 224 divisors, whose sum is σ = 259835904. Its totient is φ = 20348928.

The previous prime is 78391483. The next prime is 78391507. The reversal of 78391488 is 88419387.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×78391488² = 12290450781708288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (78391483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1073820 + ... + 1073892.

Almost surely, 2^78391488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78391488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129917952).

78391488 is an abundant number, since it is smaller than the sum of its proper divisors (181444416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78391488 is a wasteful number, since it uses less digits than its factorization.

78391488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 149 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 78391488 is about 8853.8967692198. The cubic root of 78391488 is about 427.9795023229.

The spelling of 78391488 in words is "seventy-eight million, three hundred ninety-one thousand, four hundred eighty-eight".